2002 GMC Sierra Cylinder 3 Misfire- Diagnostic code P0303

2002 GMC SIERRA
130,000 MILES • V8 • 4WD • AUTOMATIC
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OZARKS76
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What do you recommend on trouble shooting since my diagnostic code at autozone read Cylinder 3 misfire. Code# P0303
How do I locate cylinder 3 to check the spark plugs/wires? Are they numbered?
Feb 9, 2010 at 6:28 PM
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RASMATAZ
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For what liter engine?

You should check spark plug/wire,fuel injector,and compression for #3 cylinder.
Feb 10, 2010 at 12:01 AM
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OZARKS76
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5.3L V8
Feb 10, 2010 at 8:54 AM
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RASMATAZ
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5.3 liter


https://www.2carpros.com/forum/automotive_pictures/12900_fo5_1.jpg

Feb 10, 2010 at 1:56 PM